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ROC800-Series Instruction Manual
Revised Jul-14
Input/Output Modules
4-9
On the AI-16 module, you use jumper J3 to configure the AI (+T) as 12
or 24 Volts dc. Additionally, two DIP switches on the module allow you
to select between current and voltage loop input.
A
I indicates current loop input; V indicates voltage
loop input
Figure 4-6. AI-16 DIP Switches
Caution
You can induce ground loops by tying commons from various modules
together.
4.4 Analog Output (AO) Modules
The 16-bit Analog Output (AO) module has four channels that provide a
current output for powering analog devices. Analog outputs are analog
signals the ROC800 generates to regulate equipment, such as control
valves or any device requiring analog control.
Each channel on this module provides a 4 to 20 mA current signal for
controlling analog current loop devices. The AO module isolation
includes the power supply connections.
Note
:
AO modules (Part Number W38199) labeled
AO-16
are an
earlier version that controls the low side current. AO modules
(Part Number W38269) labeled
AO
are a newer version
(January 2005 and later) that provides and controls the high side
current.
The AO module includes a moveable jumper (see
Figure 4-7
). Set the
jumper to 12V if the transmitter load is 300Ω or less. Set the jumper to
24V if the transmitter load exceeds 300Ω.
A